Question

Tanya thinks that bacteria can be harmful to humans. Which effect of E. coli supports Tanya's claim that bacteria can be harmful to humans?

a) E. coli aids in digestion
b) E. coli produces vitamins
c) Different strains of E. coli affect the intestines differently
d) E. coli is only found in animals

Answer 1

Tanya's view is accurate as some strains of E. coli, like E. coli O157:H7, produce Shiga toxin leading to serious health issues, supporting her claim that bacteria can be harmful to humans.

Step-by-step explanation:

Tanya is correct in believing that bacteria can be harmful to humans. While most strains of Escherichia coli (E. coli) found in our gut are beneficial, aiding in digestion and vitamin production, certain strains can cause severe health issues. For instance, the strain E. coli O157:H7 produces the Shiga toxin, which is a potent toxin that can lead to cellular death, hemorrhagic colitis, and in extreme cases, the potentially fatal hemolytic uremic syndrome. Therefore, the correct answer to support Tanya's claim is (c) Different strains of E. coli affect the intestines differently, as some pathogenic strains produce toxins and cause illness, while others have a mutualistic relationship with humans.